What is delirium tremens (DTs)?

Delirium tremens (DTs) is the most severe form of alcohol withdrawal, occurring in approximately 3–5% of people going through alcohol withdrawal. It typically appears 48–96 hours after the last drink and involves severe confusion, agitation, hallucinations, fever, rapid heart rate, and unstable blood pressure. Without treatment, DTs carry a fatality rate of up to 15%. With proper medical care — including sedation with benzodiazepines and supportive fluids — the fatality rate drops below 2%.

Medical Guide

Alcohol Withdrawal Timeline: Hour-by-Hour Symptoms & What to Expect

Q: When is alcohol withdrawal most dangerous?

Alcohol withdrawal is most dangerous between 24–72 hours after the last drink. This is the window when seizures and delirium tremens (DTs) are most likely to occur. Seizures can happen as early as 12–24 hours. DTs — which include severe confusion, hallucinations, rapid heartbeat, and high fever — typically appear 48–72 hours in and represent a medical emergency with a fatality rate of up to 15% if untreated.

Q: What are the symptoms of alcohol withdrawal?

Mild symptoms: anxiety, tremors (shakes), sweating, nausea, vomiting, headache, insomnia, irritability, rapid heart rate. Moderate symptoms: elevated blood pressure, increased body temperature, confusion, heightened reflexes. Severe symptoms: seizures, hallucinations (visual, auditory, or tactile), delirium tremens. Not everyone experiences all symptoms — severity depends on the duration and quantity of alcohol use, prior withdrawal history, and overall health.

Q: How do I know if my alcohol withdrawal is severe?

Warning signs that withdrawal is becoming severe: a temperature above 38.5°C (101.3°F), severe confusion or disorientation, hallucinations (seeing, hearing, or feeling things that aren't there), a seizure, rapid heart rate above 120 bpm, or extremely elevated blood pressure. Any of these symptoms require immediate emergency care. Don't wait — severe alcohol withdrawal can be fatal without treatment.

Q: What happens after alcohol withdrawal ends?

After acute withdrawal (days 1–7), many people experience Post-Acute Withdrawal Syndrome (PAWS) lasting weeks to months. PAWS symptoms include mood instability, anxiety, difficulty concentrating, sleep problems, and cravings. Unlike acute withdrawal, PAWS is not medically dangerous but is a major driver of relapse. Ongoing support through therapy, peer groups, or a recovery app can significantly reduce PAWS-driven relapse risk.

What happens to your body in the hours and days after your last drink — and when the danger window passes.

By Nicholas Arata, Founder of Forge · Reviewed by the Forge Editorial Team · September 3, 2026

⚠️ Medical warning: Severe alcohol withdrawal can be life-threatening. If you experience seizures, hallucinations, severe confusion, or a fever above 38.5°C (101.3°F), go to an emergency room immediately. Do not attempt severe withdrawal at home without medical supervision.

Quick Answer

Alcohol withdrawal begins 6–12 hours after the last drink. Symptoms peak at 24–72 hours — the highest-risk window for seizures and delirium tremens (DTs). Most acute symptoms resolve within 5–7 days. Post-Acute Withdrawal Syndrome (PAWS) can persist for weeks to months.

6–12h

Symptoms begin after last drink

24–72h

Peak danger window (seizures/DTs)

5–7 days

Acute withdrawal resolves

3–5%

Rate of delirium tremens in withdrawal

The Full Alcohol Withdrawal Timeline

Alcohol acts as a central nervous system (CNS) depressant, enhancing the inhibitory neurotransmitter GABA and suppressing the excitatory neurotransmitter glutamate. When heavy drinkers stop abruptly, the CNS becomes overexcited — causing the cascade of symptoms below.

6–12 Hours

Early Withdrawal — Mild Symptoms Begin

The first symptoms appear in heavily dependent drinkers. These include anxiety, irritability, tremors (shaking hands), sweating, nausea, headache, and difficulty sleeping. The nervous system is beginning to rebound from alcohol's depressant effects.

Mild

12–24 Hours

Alcohol Withdrawal Seizures — Highest Risk Begins

Seizures can occur as early as 12 hours after the last drink. They are typically grand mal (tonic-clonic) seizures and may happen without warning. Around 2–5% of people in alcohol withdrawal experience seizures. Previous seizure history significantly increases risk. Medical supervision is critical during this window.

ModerateSeizure risk

24–48 Hours

Symptoms Peak — Hallucinations May Begin

This is typically when symptoms are most intense. Tremors become severe, sweating is heavy, heart rate and blood pressure are elevated. Alcoholic hallucinosis — hearing, seeing, or feeling things that aren't there — can occur in about 10% of people. Unlike DTs, hallucinations at this stage occur with a clear sensorium (the person is otherwise oriented). Seizure risk remains elevated.

Severe — peak risk

48–96 Hours

Delirium Tremens (DTs) — Most Serious Stage

DTs affect approximately 3–5% of people in withdrawal and typically onset between 48 and 96 hours. Symptoms include profound confusion, agitation, fever, rapid heart rate, and unstable blood pressure alongside hallucinations. This is a medical emergency. Without treatment, the fatality rate can reach 15%. With benzodiazepine therapy and IV fluids, fatality drops below 2%. If you or someone you're with develops these symptoms, call emergency services immediately.

Medical emergency — call 911

Days 5–7

Acute Withdrawal Resolves for Most People

For most people without DTs, acute withdrawal symptoms significantly diminish by days 5–7. Tremors ease, sleep begins to stabilise, heart rate normalises. Appetite returns. The acute danger window is largely over. You may still feel anxious, tired, and emotionally flat — this is normal as the brain rebalances.

Improving

Weeks 2–4

Post-Acute Withdrawal Syndrome (PAWS) Begins

After acute withdrawal resolves, many people experience PAWS — a second, protracted phase. Symptoms include mood instability, anxiety, depression, difficulty concentrating, sleep disruption, and persistent cravings. PAWS is not medically dangerous but is the primary driver of relapse in early recovery. It typically improves week by week as the brain's neurochemistry normalises.

Low risk — focus on support

Months 1–6

Full Brain Chemistry Restoration

GABA and glutamate receptors progressively normalise over months. Sleep quality reaches baseline or better. Mood stabilises. Cravings become less frequent and intense. The risk of severe relapse episodes driven by physical craving decreases substantially by month 3–6, though psychological triggers remain. Most people feel genuinely well by 3–6 months sober.

Recovery phase

Who Is at Highest Risk for Severe Withdrawal?

Not everyone who stops drinking will experience severe withdrawal. Risk is higher for people who:

Drink heavily every day (8+ standard drinks per day)
Have been drinking heavily for years, not weeks
Have experienced alcohol withdrawal before — each episode can be more severe ("kindling effect")
Have a history of seizures
Are older or have other medical conditions (liver disease, heart disease)
Have a low body weight or poor nutrition

The CIWA Scale — How Doctors Measure Withdrawal Severity

The Clinical Institute Withdrawal Assessment for Alcohol (CIWA-Ar) is the standard medical tool for measuring withdrawal severity. It scores 10 symptoms on a 0–7 scale (or 0–4 for orientation). A score below 8 indicates mild withdrawal; 8–15 moderate; above 15 severe and requiring medication.

The 10 CIWA-Ar items: nausea/vomiting, tremor, sweating, anxiety, agitation, tactile disturbances, auditory disturbances, visual disturbances, headache/fullness in head, and orientation.

Medications Used in Alcohol Withdrawal

Benzodiazepines are the gold standard for managing moderate-to-severe alcohol withdrawal. They work by enhancing GABA — the same pathway alcohol uses — preventing the CNS rebound that causes seizures and DTs. Common choices include diazepam (Valium), lorazepam (Ativan), and chlordiazepoxide (Librium).

Anticonvulsants like carbamazepine or gabapentin are sometimes used as alternatives, particularly for outpatient withdrawal with lower risk profiles. They carry less abuse potential than benzodiazepines.

Thiamine (Vitamin B1) is given to prevent Wernicke's encephalopathy — a potentially fatal neurological complication seen in people with alcohol use disorder who stop drinking. Thiamine deficiency is common in heavy drinkers due to poor diet and reduced absorption.

What Happens After Withdrawal: The Path Forward

Surviving withdrawal is the first step — staying sober is the work that follows. The brain's reward system takes months to fully normalise, which is why ongoing support dramatically improves outcomes. Options include:

Medications: Naltrexone, acamprosate, and disulfiram are FDA-approved for alcohol use disorder and significantly reduce relapse rates when used after detox.
Therapy: Cognitive Behavioural Therapy (CBT) and Motivational Interviewing have strong evidence bases for alcohol use disorder.
Peer support: AA and SMART Recovery both have evidence supporting long-term sobriety.
Recovery apps: Daily tracking, streak accountability, and AI coaching help maintain momentum through PAWS.

Frequently Asked Questions

When does alcohol withdrawal start?

Alcohol withdrawal symptoms typically begin 6–12 hours after the last drink in heavy, dependent drinkers. Mild symptoms like anxiety, tremors, sweating, and nausea appear first. The exact timing depends on how much and how long you've been drinking — daily heavy drinkers may feel symptoms within 6 hours, while those with moderate dependence may not notice them for 12–24 hours.

When is alcohol withdrawal most dangerous?

The most dangerous window is 24–72 hours after the last drink, when seizures and delirium tremens are most likely. Seizures can begin as early as 12–24 hours. DTs — severe confusion, hallucinations, fever — typically appear 48–72 hours in and are a medical emergency with up to 15% fatality without treatment.

How long does alcohol withdrawal last?

Acute alcohol withdrawal typically lasts 5–7 days. Mild symptoms peak at 24–48 hours and resolve within a week. Post-Acute Withdrawal Syndrome (PAWS) with mood swings, sleep problems, and cravings can persist for weeks to months.

Do I need medical supervision to quit drinking?

Heavy daily drinkers should always consult a doctor before stopping abruptly. If you drink more than 8 drinks per day, have a seizure history, or have withdrawn before, medical supervision is essential. Doctors can prescribe benzodiazepines to reduce seizure risk.

What is delirium tremens?

Delirium tremens (DTs) is the most severe form of alcohol withdrawal, occurring in 3–5% of cases. It appears 48–96 hours after the last drink and involves severe confusion, hallucinations, fever, and rapid heart rate. Without treatment, the fatality rate can reach 15%. With benzodiazepine therapy, it drops below 2%.

How do I know if my alcohol withdrawal is severe?

Warning signs: temperature above 38.5°C (101.3°F), severe confusion, hallucinations, seizures, rapid heart rate above 120 bpm, or severely elevated blood pressure. Any of these require immediate emergency care.

What are the symptoms of alcohol withdrawal?

Mild: anxiety, tremors, sweating, nausea, headache, insomnia. Moderate: elevated blood pressure and temperature, confusion, heightened reflexes. Severe: seizures, hallucinations, delirium tremens. Severity depends on duration and quantity of use, prior withdrawal history, and overall health.

What happens after alcohol withdrawal ends?

After acute withdrawal (days 1–7), many people experience PAWS — mood instability, anxiety, sleep problems, and cravings for weeks to months. PAWS is not dangerous but is the primary driver of relapse. Ongoing support through therapy, peer groups, or a recovery app significantly reduces PAWS-driven relapse.

Nicholas Arata

Founder, Forge · Reviewed by the Forge Editorial Team